Here are some answers to your questions:
1 - No, you do not need to attach the payment voucher to the return if you are not also attaching a payment. You can pay using another method up to April 15, 2025.
2 - Yes, you do need to attach one section of your W-2 to both your Federal and state returns. The little individual sections are labeled as 'Federal copy' and 'state copy'. If you have any other tax documents that show Federal or state taxes withheld, then a copy of those should also be attached to the return.
3 - No, the IRS does not need a copy of your state return.
4 - Yes, the state may need a copy of your Federal return.
5 - See this link for addresses to mail your Federal return. Use this link for addresses to mail your California return.
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